Printing press



F. FALLERT PRINTING PRESS March 14, 1933.

Filed March 24; 1931 2 Sheets-Sheet 1 Inventor F/WTZ PALLE/(f7 A .TTORNEKS Marchm, 1933. FALLERT 1,900,923

PRINTING PRESS Inventor# FRITZ FALl/ ERT A TTORNEYS Patented Mar. 14, 1933 FRITZ FALLERT, OF BERN, SWITZERLAND PRINTING PRESS Y Application filed March 24, 1931, serial N02 524,834, ana in Germany Juneae, 192s. i

Printing' presses for printing both sides of the paper web are known, in which two This invention relates to a device on such presses which effects the intermittent rotation of the perfecting cylinder mounted in the slides, the inking rollers ofwhich are mounted in the same slides, the stroke of which for 'inking the entire forme must thereu fore be longer than the format of the matter '1 to be printed and the corresponding peripheral dimensions of an impression cylinder.

In a known printing press of this construction, the driving pinions connected to the impression cylinders and actuated by racks mounted on the frame ofthe machine are `said toothed members. By means of this con- `trol device, the'auxiliary toothed members in combination withv the pinions proper' operate in such a manner, that the printing cylinders, as soon as the cylinder slide during the drawing in of the paper webhas performed a stroke corresponding to the heightp of the formatoffthe matterY to be printed, adjacent one of the dead pointpositions suddenly will start to rotate witha peripheral velocity corresponding'to the speed ofthe slide and during the furtherA movement towards the dead point and also during the rer turn movement towards the other dead point will continue to krotate with a peripheral ved ed to be swung into and out of the path of 'trol with the slide in position B.

locity corresponding to the speedof the slide.` Since 1n the described control the impressionr cylinders are suddenly rotated from a standstill' with a peripheral velocity corresponding tothe speed of the slide without any intermediate stage, jolts which lset up uneven running in the press and heavy material stresses, are Vliable to'occur especilly at high speeds. c

The purpose of the invention is to enable Vthe change from a standstill to the full peripheral velocity'of the impression cylinders to proceed gradually. Accordingly the auxiliary racks are Vso arranged that they are able when' Vbrought into vengagement to de' 65 scribe a movement inthe direction of that of the slide and thus by gradually lowering their speed in relationV to that of theV slide set the impression cylinders revolving smoothly.V It is true that a length of paper exceeding that of the format of the printed matter is at first drawn from the web, this excess is taken up again during the return of the slide, because these'auxiliaryracks also slip backfuntil just before. the impression begins, and the peripheral velocity of the impression cylinders isl correspondingly reduced.V i

Thev invention will be clearly understood from the following description aided bythe B0 [annexed drawings in which one typicalembodiment Vof the invention as' applied to a Vprinting press having two vertically disposed and oppositely fixed is illustrated and in which Fig. 1 is a vvertical section in partial side printing formes,n

Velevation of the control arrangement and the drivefor the impression cylinders, the rack driving mechanism for the impression cylinders being shown on the left of the figure,

and the new control on the right.

Fig. Q is a. partial elevationV of the arrangement in Figure .l and shows the con- "Figure 3 is a partial vertical section 95 through the'inking gear mounted in slides, with a side elevation of the printing bed.

Figure 4 is a cross section on a larger scale', above the slide and partial section through the impression cylinders throughV the representation according to Figure 1 in plan.

Figure 5 shows the arrangement of the control drive in cross section, through the arrangement according to Figure 1 and in plan.

In the drawings Figure 1 represents as a typical embodiment a known printing press with two vertical printing formes oppositely mounted in fixed position each of which coacts with a corresponding impression cylinder 1, the cylinders being mounted in a common slide 2 which is adapted to move up and down. The printing beds are hinged in the press so as to open and close. The slide 2 is moved up and down by means of the crank wheels 8 and crank rods l, arranged on each side of the press. The length of the format of the printed product is indicated by the letters A. and B in Figures 1 and 3, whilst the letter C shows the end position of the impression cylinders in the upper dead point. During the upward movement of the slide 2 from the dead point A to B, the impression cylinders remain stationary. At B the actuation of the cylinders begins and these revolve until they reach the upper dead point C. The distance thus traversed corresponds to the stroke necessary to allow the roller 6, which inks the formes 5, to pass beyond the end of the latter.

During their downward travel from C to A, the impression cylinders 1 at first turn back as far as B, into the position in which the centre of the channel is over the end of the format, and then describe their rotary or rolling movement over the formes. The positive actuation of each impression cylinder 1 is effected in known manner by means of pinions 7 which are mounted on the impression cylinders and gear with racks 8 (Figures 1 and 1l), bolted on to the side members 10 which accommodate the fixed printing beds 9. As can be seen more aarticularly on Figures 1 and 2, the pinions 7 are provided on that side which faces the channel side 11 of the impression cylinders, with Hats 12 where he teeth are cut away so that during the upward movement of the slide 2 when the impression cylinders must remain stationary the pinions 7 do not engage the racks 8 (Figures 2 and The impression cylinders 1 mounted in the reciprocating slide 2 are provided with driving pinions 7 which are flattened at the parts facing the channels in the impression cylinders and can therefore slip over the racks 8 on the frame of the press, whereas they roll over the racls when brought into engagement therewith, The slide is actuated by the pitman 4. ln order to bridge over the gaps in the pinions 7, the impression cylinders are also provided with adjacently mounted toothed-segment pinions 13, which engage in the manner hereinafter described with the auxiliary racks 17, when the slide is in the top position and with the rack levers 15 when the slide is in bottom position.

ln order to prevent accidental rotation of the impression cylinders during the insertion of the paper web, each impression cylinder is provided with a special lever which is mounted on the slide 2 and one arm 0f which 18 engages in a groove on the pinion 13, by means of the roller 19, whilst the other arm 18a is guided by means of the roller 2() in a groove 21 in the lateral guide rod 22.

Gn their upper ends, the lateral guide rods 22 carry the auxiliary racks 17 and are guided by means of curved slots 2B provided at their ends and by rollers 24 and pins 8a of the racks 8 (Figure 1 left) in such a way that at a certain point of their vertical displacement they are displaced laterally. As can' be readily seen from Figure 1 this lateral displacement of the guide rods 22 swings into the path of the toothed segments 13 the auX- iliary raclis 17 (attached to the rods 22) together with the rack levers 15 which are pivotally mounted on the pins 25 also attached to the racks 8, and engage in slots 21 in the guide rods 22 by means of rollers 26, whilst at the same time the levers 18, 18a release the impression cylinders.

The new control operates in the following manner. While the slide 2 is traversing the distance from A to B which corresponds to the length of the format of the printed matter, the rods 22 are pushed upwards in their curved guides in such a manner that shortly before B is reached the toothed segments 13 come into engagement with the racks 17 which at the commencement of engagement have the same velocity as the slide or nearly so. As soon as the engagement is effected the speed of the auxiliary racks in relation to the movement of the slide diminishes, and the cylinders accordingly begin to revolve. Before the dead point C is reached the auxiliary racks 17 move backwards again, thereby imparting additional motion to the cylinders as far `as the dead point C. ln this way a length of paper web exceeding that of the format is drawn in at first but after the slide is reversed the racks 17 are moved further rear-wards, until just before the impression begins, thus retarding the peripheral Velocity of the impression cylinders by comparison with the velocity of the slide and thereby compensating the previous excess in the draft of the web. Shortly before the impression begins in the position in which the teeth of the auxiliary racks 17 are in line with those of the racks 8, the movement of the racks 17 ceases and the cylinders l-the pinions 7 of which now gear with the racks 8roll over the formes at a peripheral velocity equal to the speed of the slide.

In front of the dead point A, the toothed segments 13 come into engagement with the rack levers 15, thereby causing the impression cylinders to revolve until the dead `point A is reached and the channels are adjusted yparallel with the formes. The descent of the slide is accompanied by a downward movement of the guide rods 22, in such a manner that when the impression cylinders are at the dead point A the rack levers 15are swung out of the path of the toothed segments, whilst the simultaneous swinging of the check levers 18, 18a into action prevent the impresv sion cylinders from turning.

length and retardation in relation to the movement of the slide, the racks 17 could, for

example be engaged at such a distance in front of the point B as to cause a length of paper equal to that of the format, to be drawn from the web during the movement of the slide up to the dead point C. In this case the auxiliary racks 17 are not moved during the return movement of the slide so long as they are able to engage the toothed sectors 13. In such case the return of the racls17 into their initial position takes place only during the impression or thereabouts.

For reasons of weight land in order to ob-V tain minimum forces of acceleratiomthe' impression cylinders may be constructed` of aluminium or the like, whereas in view of rigidity of mounting, their journals are of strong metal and for this purpose are provided with flanges which `as shown particularly in Figure 4, overlap the cylinders and are bolted thereto. e

1. In a printing press, having vertically disposed vprinting beds and having impression cylinders provided with channels and mounted in a rising and falling slide, a drive" and control arrangement, comprising verti-Vv cal racks mounted on the frame of the press, pinions connected with theimpression cylinders and engaging said vertical racks during the movement of the slide, a toothless gap on the periphery of each of said pinions corresponding to said' channels on the impression cylinders, an auxiliary drivingmechanisni for bridging over said gapsv in the drivingl pinion and for initiating the rotation of the printing cylinders and means for bringing said auxiliary driving mechanism into operaand means for bringing said auxiliary racks tion'in such a manner, that the impression cylinders gradually are brought fromV a standstill to the full peripheral velocity.

ing the movement of the slide, a toothless gap Y v on the periphery of each of said pinions corresponding to said channels on the impression cylinders, auxiliary toothed membersI beside said pinions on the impression 'cylinders, positively controlled auxiliary racks adapted to be swung out of and into engagement with said auxiliary toothed members,

into lengagement wth said toothed members and initiatingthe rotation of the impression Y cylinders in such a manner that the impression cylinders gradually are brought from a. standstill to the full peripheral velocity.`

3. In a printing press, having vertically disposed printing Ibeds and having iinpression cylinders provided with channels and Y mounted in a rising and falling slide, a drive and control arrangement, comprising vertical racks mounted on the frame of the press, pinions connected with the impression cylinders and engaging said vertical racks during the movement ofthe slide, a toothless gap, on the periphery 'of each of said pinions corresponding to said channels on the impression cylinders, auxiliary toothed members beside said pinions on the impression cylinders, positively controlled displaceable auxiliary racks adapted to be brought into engagement with said auxiliary toothed members andinitiate the rotation. of said printing cylinders, and means for moving said auxiliary racks in the direction in which the slide isV moved and for simultaneously swinging said auxiliary racks into the path of said toothed members in order to produce such engagement. Y

4. In a printing press, having vertically disposed printing beds and having impres-v sion cylinders provided with channels and2 mounted in a rising and falling slide', a drive and control arrangement, comprising vertical racks mounted on the frame of the press, pinions connected with the impression cylinders and engaging said vertical racks during the movement of the slide, a. toothless gap on the periphery of each of'said pinions corresponding to said `channels on the impression cylinders, auxiliary toothed members beside said pinions on the impression cylinders,

and initiate the rotation of said printing cylcsi inders, guide rods carrying said auxiliary racks, curved guide slots on the ends of said guide rods, guide rollers mounted on the frame of the press and cooperating With said guide slots to swing the auxiliary racks into Athe path of the tootlied members and means for reciprocating said guide rods and displacing the auxiliary racks in the direction of movement of the slide.

5. ln a printing press, having vertically disposed printing beds and having impression cylinders provided With channels and mounted in a rising and falling slide, a drive and'control arrangement, comprising vertical racks, mounted on the frame of the press, pinions connected with the impression cylinders and engaging said vertical racks during the movement of the slide, a tootliless gap on the periphery of eacli of said pinions corresponding to said channels on the impression cylinders, auxiliary toothed members beside said pinions on the impression cylinders, positivelyr controlled displaceable auxiliary racks adapted to be brought into engagement with said auxiliary toothed members and initiate the rotation of said printing cylinders, and means including a cam slot in a disc coupled to the main drive of the press for reciprocating said guide rods and displacing tlie auxiliary raclrs in the direction of movement of the slide.

In testimony whereof l ailix my signature.

FRITZ FALLERT. 

